In recent years, carbon nitride, a new type of two-dimensional (2D) material, has attracted great interest, in terms of fundamental scientific investigation and potential practical applications, for a range of energy and environmental technologies. This can be largely attributed to its optoelectronic and physicochemical properties, including moderate band gap, adjustable energy band configuration, tailor-made surface functionalities, low cost, metal-free nature, remarkable thermochemical stability, and environmentally benign manufacturing protocol. Nanostructured Carbon Nitrides for Sustainable Energy and Environmental Applications offers a comprehensive, authoritative, and critical account of the recent progress in the development and application of multifunctional carbon nitride materials and their hybrid heterostructures. There are two major objectives of this book: first, to provide a systematic overview of the key design principles toward the fabrication of high-performance carbon nitride–based nanostructures; and second, to provide insights into a range of clean energy technologies and environmental remediation methods that build on these nanoengineered carbon nitrides. This book serves as an important reference source for materials scientists and engineers who are interested in developing their understanding of how carbon-based nanomaterials are being used for sustainable energy and environmental applications.